Stumbled upon HTTPie, a command line HTTP client. It's pretty awesome. Basically it's Curl on steroids, as it has an easy interface and syntax highlighted output.
Here's an example of a simple GET request to the Bacon Ipsum JSON service:
Of course you can do actual useful stuff as well, such as POST-ing, Authentication, Cookies, Custom Headers, etc.
As the repo says, the main features are:
I haven't played with it much yet, but so far it seems like a rather useful little tool, worth checking out.
You can get it here